Oeyo, also known as Ogo, (played by Juri Ueno) is the third daughter of Azai Nagamasa and Oichi (Oda Nobunaga's younger sister). Towards the end of the war, Gou lost her parents and became known as one of the famous three sisters during the Warring Times. Gou would go onto marry the second shogun Hidetawa Tokugawa and eventually give birth to the third shogun Iemitsu Tokugawa. Gou would also helped create the "Ooku" in Edo, Japan to bring peace & prosperity ...

Gou's eldest sister Yodo (Rie Miyazawa) becomes the second wife of her late mother's enemy Hideyoshi Toyoyomi. Because of this Yodo and Gou enters a hostile relationship.
Hatsu (Asami Mizukawa), the middle sister, attempts to improve the relationship between her sisters and the Tokugawa & Toyoyomi families.